My megaproject ideas are mostly pretty standard. I'd build a high speed rail network across North America, and build and expand metro and regional rail systems in and around every city. I'd turn all cities and suburbs into fifteen-minute cities. I'd decommodify housing, and build ten million units of public/social/non-market housing, mostly three bedroom units. I'd link those last three policies together by building TODs around the new Metro and rail stops. And I'd build bicycle networks in every town and city and connect them to the TODs. I'd build bridges and walkways across skyscrapers. I'd put a bidet in every American toilet (uses less water than toilet paper apart from being more comfortable). Fiber internet in every home. A heat pump in every home. An induction stove in every kitchen. Phase out fossil fuels and power everything with Pumped Storage Hydropower and Geothermal. I'd make the US go Metric.
But my truly crazy, obsessive idea would be to bring back the French Revolutionary calendar. Or I'd purge all French influences from English.
I would bring big efforts to resurrect the Irish language by having all sporting events, news broadcasts etc in Irish, having Irish be taught in school before English, having social events where people are expected to speak Irish etc. However this would merely be a Trojan horse for my real goal: slyly take out gendered pronouns from Irish and have everyone's pronouns be gender neutral by default, and only otherwise if specified.
It should be obvious that I'm Irish but we can apply this to any Anglophone country. England speaks Irish now, fuck you